Process of making hollow rubber articles having seams.



No. 868,663. PATENTED OCT. 22, 1907. I. P. KEPLER.

PROCESS OF MAKING HOLLOW RUBBER ARTIGLES HAVING SEAMS.

APPLICATION FILED AUGA. 1905;

FIGJ;

v WITNESSES: 2' j t VENTOR 4 BY 7/0/1111/11/1111/1711111M v UNITED STATES rnrnn'r osrron.

IRWIN FLOYD KEPLER, OF AKRON, OHIO, ASSlGNOR TO THE F. GOODRICHfCOMPANY,

OF AKRON, 01110, A

CORFORATION OF OHIO.

PROCES$ OF MAKING HOLLOW RUBBER ARTICLES HAVINGSEAMS. A

- Application filed August 4 To all whom. it may concern:

Be it known that l, IRWIN FLOYD KEPLER, a citizen of the United States of America, and a resident of the city of Akron, county of Summit, State of Ohio, have invented certain new and useful Improvements in the Process of Making Hollow Rubber Articles Havingdurable and less expensive bag-body than can be made the subject of a companion application.

by any of the processes now in use.

The article which results from this process is made At present bag-bodies are made in several ways: 'Two sides hr wallsare cut from uncured sheet rubber," the two being made of the same size and the edges then united. This may be done in several different 'ways. For example, they may be joined by hand over a man "rel, or as described in my patent, No. 761,890, a piece of uncured rubber maybe inserted between the edges before cutting the sides and the cuttipg and edge-joining done in a matrix die press. After these edges have. been joined in any appropriate manner a binding strip of thin sheet rubber is cemented over the edge-joint around the periphery of the bag. These cemented parts are pressed together before afiixing the necks,

funnel, hanging and carrying'straps, after which the whole is vulcanized.

The essential feature of my invention lies in the method of making these edge-joints, the object being to'produce a more durable-joint which shall, at the same time, be simpler and therefore lessexpensive, lessening the waste due to imperfect joints. I accomplish these objects by the process hereinafter described, reference being had to the accompanying drawings which form a part of this specification. I

- In the drawings Figure 1 shows th e'comparative size of the two sides and the manner of superposing the smaller on the larger; Fig. 2 illustrates the process of making the joint. Fig. 3 shows a portion of the bagbody having completed joints. Fig. 4 is a cross-section through the edge-joint. Figs. 5 and 6 'show two methods of reinforcing the joint.

Throughout the. drawingslike reference numerals refer to like parts. p Two sides or walls of the bag-body l and 2 are cut from a sheet of un-vulcanized rubber preferably by the use of matrix die presses, which may, at the same time,

imprint upon the rubber any desired ornamentation.

. Specification of Letters Patent;

Patented Oct. 22, 1907,

, 1905. Serial No. 272.726.

. 2 with any suitable powder, in order to prevent the uniting of the two sides under the heat of vulcaniza tion, the smaller sheet 1 is laid upon the larger sheet 2 larger side is then coated with rubber cement or other" ladhesive material, turned over upon the smaller sideshows a portion of the bag-body at the completion of this stepinthe process. Fig is across-sectional view of the-'edge-joint. The funnel, screw-neck, ear rying and hanging-strap or any desired trimmings are then attached in the usual manner and the whole vul canized by any of the usual methodsig "If desired the edge-joint may be reinforced either by inserting a longitudinally folded strip of rubber 3,. Fig. 5, beneath the edge of the side 1, before turning side binding 4, Fig. 6, after the joint is made, as is usually done at present. In practice, however, this reinforce is found to be unnecessary, the joint being the bag. This importantresult follows from the fact that the edge of the bag-body is able to resist strain or wearjbecause it is'not at the point of union of the two sides as in the ordinary bags, but is'formed'by a homogeneousportion of the larger side at some distance from' its edge; Moreover the joint at that point is upon the inside of the bag while the outside joint is at some distance from the fold.

Having described my invention, what I claim is:.

1. The process of making hollow rubber articles having seams, consisting in cutting from uncured rubber sheets; two similar blanks of unequal size, edge-joining the blanks by causing the inner edge of the outer blankto adhere to the outer edge og'the inner blank and vulcanizing the article so formed.

2. The process of manufacturing hollow rubber articles which consists in cutting blanks fromuncured rubber sheets, one blank of slightly greater area than the other, super-posing the smaller on the larger, turning over the projecting margin upon the smaller, and vnlcanizing the whole. l

3. Theprocess of manufacturing hollow rubber articles which consists in cutting, from uncured rubber, blank-sot slightly unequal,area, centrally super-posing the smaller upon the larger, coating with adhesive material the proover upon the smaller blank, and vulcanizlng the whole. I 4. The process of manufacturing rubber bag-bodies whichjc'onsists in die-cutting two blanks from uncured superposlng the smaller upon the larger, coating the margins of the blanks with adhesive material, overlaying the projecting margin upon the smaller blank, and vulcanizing the'whole.

which consists in forming with cutting and embossing dies sides or walls of uncured rubber similar in form but slightly unequal area, superposing the smaller upon the ,as shown in Fig. l. The projecting margin of the.

land by pressure caused to adhere firmly in place. Fig. 32 shows the method of turning over edge and Fig. 3

over the edge of the larger sheet or by attaching an out-5 practically as strong and durable as any other portion of.

as g

jecting margin of the larger blank, turning said margin rubber sheets similar in form but of slightly unequal area,

5.'The process of manufacturing rubber bag-bodies- Iarg'er f0lding the projecting margin over the edge of the smalleuside, interposing a coating of adhesive material, hand vulcanizing the Whole.

' 6. The process of manufacturing rubber hag-bodies which consists in cutting from juncured rubber two sides -.:-or-.wa1ls with parallel'edzes but with slightly unequal areas, centrally superposingthe smaller upon the larger, coating with adhesive material the projecting margin of.

the. larger side, folding said margin overthe edge of the '5maller side, uniting the edge-joint by pressure, and vulcanizing' the whole.

' 7. The process ef manufacturing rubber 'bag-bodies which consists in cutting from uncured rubber two sides or Walls with parallel edges but slightly unequal in area,

super-posing the smaller upon the larger, coating with ad hesive material the projerting margin of the larger side,

folding said margin over the edge of the smaller sidelxap plying a binding strip of rubber overlapping the joint edges unifing the strip and edge-joint, and vulcanizing the whoiei; I

1 8. The process of manufacturing rubber ba -bodies which consists in cutting from uncured rubber two sides or walls having parallel edges but slightly unequal in are superposing the smaller upon the larger, inserting a reinforcing' strip between the adjacent sl'des, coating with .iolding said margin over the edge of the smaller side, unit- I 

